<svg xmlns="http://www.w3.org/2000/svg" style="filter: url(#a); clip: rect(0px, 4rem, 2px, 2px);">
    <script>
        function boom()
        {
            document.getElementById("a").style.overflow = "hidden";
            document.documentElement.style.fontSize = "10px";
        }
        window.addEventListener("load", boom, false);
    </script>

    <set id="a"/>
</svg>
